Chapter 1: Overview 17
24 V and 32 V Systems - 10kW scanners
10 kW open array scanners can use any combination of inter-unit
cable up to a maximum length of 35 m. However, these systems use
considerable power and installations should be planned to minimize
all cable lengths. Refer to the tables on page 1-19, Max. Extension
Power Cable Lengths (m) - 10 kW Scanner.
Power cable
The open array scanner systems are intended for use on ships’ DC
power systems operating in the following ranges:
4 kW 10.7 to 44 V DC range (that is, 12 V, 24 V and 32 V systems)
10 kW 20 to 44 V DC range (that is, 24 V and 32 V systems).
CAUTION:
10 kW open array scanner systems cannot be used directly with
12 V systems; they require a 12 V to 24 V converter rated to
180W. Contact your authorized Raytheon dealer or distributor
for details.
Open array scanners draw considerable power from the vessels
power source, especially in high wind speeds. It is essential for
reliable operation that the unit is supplied with a low resistance power
cable system, especially when operated from a 12 V power system.
CAUTION:
Do not use the open array scanner with an SL70 or Autohelm 7"
LCD display unit. Failure to observe this may result in
permanent damage to the display unit.
12 V systems (4 kW scanners only)
Extensions to the supplied power cable must be kept to a minimum
and the power should be fed directly from the output of the battery
isolator switch via its own dedicated cable system. It is recommended
that no additional power switch is included in this power cable.
CAUTION:
The display unit does not include a fuse for scanner power, so an
in-line fuse or circuit breaker MUST be included in the power
cable.
All power connections must be of high quality to minimize their
resistance and to remove the risk of accidental shorts. Recommended
154_4.book Page 17 Wednesday, October 25, 2000 3:02 PM